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CO oxidation over Pt/Ce–Zr oxide catalysts with low content of platinum and cerium components

Paper ID Volume ID Publish Year Pages File Format Full-Text
55100 47040 2013 6 PDF Available
Title
CO oxidation over Pt/Ce–Zr oxide catalysts with low content of platinum and cerium components
Abstract

The Pt catalysts supported on ceria–zirconia support with the Ce/Zr ratio of 1/3 (Pt/CZ(1/3)) were prepared. The catalytic activities of CO oxidation over Pt/CZ were investigated and compared with that over Pt/Al2O3. The CO oxidation reaction on Pt/CZ catalysts initiated at ca. 50 °C with no relation to the platinum loadings. From the estimation of activation energies and TOF, it appeared that the role of platinum particles was similar in Pt/CZ catalysts with the different platinum loadings. On the other hand, in Pt/CZ catalysts with the small platinum loadings, the platinum particles highly dispersed on the surface of CZ support. In addition, it was confirmed that the dispersion of platinum particles in Pt/CZ was higher than that in Pt/Al2O3. TPR measurements revealed that oxygen storage capacity (OSC) of CZ support enhanced the CO oxidation reaction. These results suggested that highly dispersed platinum particles and the oxygen storage capacity of CZ contributed to the high catalytic activities of CO oxidation.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (203 K)Download as PowerPoint slideHighlights► The Pt catalysts supported on ceria–zirconia support with the Ce/Zr ratio of 1/3 were prepared. ► The CO oxidation reaction on Pt/CZ catalysts initiated at ca. 50 °C with no relation to the platinum loadings. ► In Pt/CZ catalysts with the small Pt loadings, the platinum particles highly dispersed on the surface of CZ support. ► The highly dispersed platinum particles and the oxygen storage capacity of CZ contributed to the high catalytic activities of CO oxidation.

Keywords
Platinum; Ceria; Zirconia; Catalyst; CO oxidation; OSC; Dispersion
First Page Preview
CO oxidation over Pt/Ce–Zr oxide catalysts with low content of platinum and cerium components
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 201, 1 March 2013, Pages 79–84
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis